That reminded me a bit of Enter the Gungeon, hahaha! The graphics were good and the gun sound effects were great as well. The character moved a little too slow, and pair it with no way to defend against bullets other than moving away and the bullets being much faster than you, I can see why you went for that regenerating health system. I just felt it was weird, made the gameplay a little slow for an action game. It was also really short too, but we have to understand it's a game jam. As a prototype, it works perfectly well. If you add more levels and enemy types, as well as more weapons and maybe a dodge roll or a shield, it would be great! So yeah, it just needs mroe features. Good job!